System for transmitting communications.



- I LIIIIIIIIIIIIIIIWJW 0. V. LOGWOOD. SYSTEM FOR TRANSMITTINGCOMMUNICATIONS.

APPLICATION FILED M11122. I9l6.

Ptentd Mar. 6, 1917.

Y I 1A0 7' .ep fi I s nvewto z crmnnns vgnoswoo'n, or nnw'YbnK, N. i,-AssIGivon TO DIE ronns'r RADIO Tenn, rnonn AND TELEGRAPH COMPANY, or NEWYORK, N. Y., A CORPORATION- or DELAWARE.

SYSTEM FOR TRANSMITTING COMMUNICATIONS.

' App1ication filed January 22, 1916. Serial No. 78,641.

To all whom it may concern:

Be it known thatI, CHARLES V. Loswoon,

a citizen of the United States, residing. at

A further object is to provide a method and circuits for producing,radiating or transmitting andcontrolling in accordance with signals tobe sent, high frequency continuous oscillating electrical waves.

Further objects of the invention will ap-- pear morev fully hereinafter.

The invention consists substantially in the circuit arrangement foraccomplishing the purposes thereof, as. shown in the ac-' companyingdrawing, and finally .pointed out in theappended claims.

Referring to the drawing, the single view thereon shows one circuitarrangement for accomplishing the purposes of my invention, where Udesignates an evacuated vessel of the three electrode type, containingthe filament electrode F, and the wing and grid electrodes W, G, in thisinstance shown in sets of two-connected in parallel, the grid electrodesbeing intermediate the wing, forming an oscillator of the well knowntype of oscillating audion known as the oscillion. The filamentelectrode F is heated from the current'source A through the controllingresistance R.

The grid and-plate electrodes are connected to the respective treminalsof an inductance P which is preferably made adjustable, as shown, butbetween the grid electrodes and the inductance P is connected a stoppingcondenser C. The wing or plate electrodes W are connectedthrough-the-inductance P and choke or impedance coil K, with thepositive terminal of current sourceB, preferably a direct current dynamoof from 500 to 1500 volts, as shown. The

negative terminal of the source Bis con-- nected to one leg. of thefilament electrode Specification of Letters Patent.

Patented Mar. 6, 1917.

F, and a condenser 0' of relatively large capacity is connected acrossthe terminals of the source B and the choke or impedance coil K, all asclearly shown. The grid electrodes G are connected to one leg of thefilament electrode F through. a c0il.T and very high resistance R",thereby forming a' high resistance leak pathbetween these twoelectrodes.

Whenthus connected, I find that the sys- I tem becomes a very energeticand efiicient generator of electrical oscillations through the coil Pand stopping condenser G, the period of which depends largely upon theamount of inductance and capacity thereof, and also, to some degree,upon the amount of resistance in the grid-filament leak path,

thev temperature of the filament, etc.,' as isv well understood.

'When the leak path is completely broken as by a Morse key Y, or othersuitable switch, the system ceases to generate electrical oscillations.It is easy, therefore, to control the generation and radiation of thesystem by the manipulation of the Morse I key or switch Yin the leakpath.

Similarly, the energy-taken by the oscillion from the source B andtransformed into alternating current energy, is largely dependentuponthe magnitude and-polarity of the electric potentials resident atConse-- quently, if in the leak path from the grid electrode G, be.connected a secondary coil any instant on the grid electrodes.

T, of a high tension, audion-f req uency transformer, and if the primarywlndmg S.

thereof 'be connected to a microphone M- through. a battery: B in theusual manner, potentials are impressed between the grid and the filamentelectrodes of the oscillion in accordance with sound waves whlch arecaused to impinge against the 5 diaphragm D of the microphone. Thus theamplitudes ofthe alternating currents set up in the wing grid circuit ofthe oscllllon through the coil P are caused to vary through wide limitsin perfect accord With the amplitudes of the sound waves in themicrophone. Thus the system becomes, when the switch K is maintainedclosed, a very efficient radio telephone transmitter.

-' I find that when an antenna and earth by .the antenna earth capacity,indicated in dotted lines at C, shunted around the in-= ductance P. 'Ifdesired, and as shown, an additional capacity as condenser C may beinserted in the antenna-earth circuit, but

this condenser, I find, is not necessary. In

this system, therefore, the current of the antenna is independent of anytuning of two circuits, as is shown by the hot wire ammeter 0 connectedin the antenna earth circuit, which, I have found, varies but little asthe inductance P orthe capacity C is varied, the small variationsindicated in the ammeter 0 being due entirely to the changes in theantenna radiation resistance as the wave length of the singleoscillating circuit P, C, C is varied.

It will be seen, therefore, that I provide a transmitting systememploying but a single oscillating circuit, which is characterized by aneiiiciency of radiation independent of the tuning of the oscillatingcircuit.

It will also be seen that 1 have provided a transmitting system whereinthe oscillating circuit associated. with the source of oscillatingcurrent isat the same time. the

radiation circuit of the system, thereby greatly reducing the amount ofapparatus and circuits needed for transmitting pur-' poses, and at thesame time secures more efi'icient, and quicker service.

Having now set forth the objects and nature ofmy invention, and havingshown and described oneembodiment thereof, what I claim as new andusefulv and of my own invention, and desire to Patent, is,

LMeans for generating and transmitting electrical oscillationscomprising an evacsecure by Letters uated vessel containing two coldelectrodes and a hot electrode, said cold electrodes being locatedatrelatively different distances from said ho't electrode, an inductanceconnected between ,said cold electrodes, and an electromagnetic waveradiating member con ductively connected directly to one of saidelectrodes.

Means for. generating and transmitting electrical oscillationscomprising an evacuated vessel containing wing and grid and filamentelectrodes, an inductance. connected between saidwing andgrid'electrodes, and a radiating member conductively connected directlyto said wing electrodes.

3. Means for generating and transmitting electrical oscillationscomprisin an evacuated vessel containing ,two cold electrodes and ahotelectrode, said cold electrodes being located at relatively differentdistances 63- from said hot electrode, an inductance connect'ed betweensaid cold electrodes, and an electromagnetic wave radiating memberconductively connected directly to one of uated vessel containing a hotand two cold electrodes, said .cold electrodes being located atrelatively difl erent distances from said. hot electrode, an inductance,connected between said cold electrodes, a radiating member conductivelyconnected directly to one of said cold electrodes, a leak pathconnecting the other of said cold electrodes with said hot electrode.

6. Means for generating and transmitting electrical oscillationscomprising an evacuated vessel containing a filament, a grid and a wingelectrode, an inductance connected between said wing and gridelectrodes, a radiating member connected tosaid wing electrode and ahigh resistance leak path connecting said grid electrode with saidfilament electrode.

7. Means for generating and transmitting electrical oscillationscomprising an evac 'Juated vessel containing a filament, a' grid and awing electrode, an inductance connected between said wing and gridelectrodes,-

a radiating member connected to said wing electrode and a highresistance leak path connecting said grid electrode with said filamentelectrode and means'for breaking the circuit of said leak path.

8. Means for generating'and transmitting electrical oscillationscomprising an evacuated vessel containing a. hotand two cold electrodes,said cold electrodes. being locatedat relatively difierent distancesfrom said hot electroda'an inductance, connected between said coldelectrodes. a radiating mem ber connected'to one of said coldelectrodes, a leak path connecting the other of said cold electrodeswith said hot electrode and means for breaking the circuit of said leakpath.

9. Means for'generating and transmitting electrical oscillationscomprislng an evacuated vessel containing a hot and two coldelectrodessaid cold electrodes being located at relatively difierentdistances from said hot electrode, an inductance, connected between saidcold-electrodes, a radiating member conductively connected directly toone of said cold electrodes, a leak path connecting the other ofsaikcold electrodes with trodes :1.

said hot electrode and means included in said leak path for varying thepotential impressed on the coldelectrode thereof in accordance with theamplitudes of sound Waves.

10. Means for generating and transmitting electrical oscillationscomprising an evacuated vessel containing a filament, a grid and a Wingelectrode, an inductance connected between said wing and gridelecradiating member connected to said wing electrode and a highresistance leak path connecting said grid electrode and said filamentelectrode and means included in said leak path for varying the potentialimpressed on said. grid electrode in accordance with the amplitudes ofsound waves.

11. Means forgenerating and transmitting generated oscillationscomprising an evacuated vessel containin hot and cold electrodes, saidcold electro es being located at relatively different distances fromsaid hot electrode, cuit comprising the radiating circuit directlyconnecting two of said electrodes.

and a single oscillating cir- In testimony whereof I have hereunto set wmy hand on this 17th day of January; A. D.,

CHARLES v. Loowoon.

